Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Aplicativos da Liga (sub) máximo?
 ###Tabelas: CREATE TABLE most_goals (most_goals_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Nation VARCHAR, Career VARCHAR, Goals INT, Appearances INT) CREATE TABLE sheffield_united_career (sheffield_united_career_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Division VARCHAR, League Apps (Sub) INT, League Goals INT, FA Cup Apps (Sub) VARCHAR, FA Cup Goals INT, FL Cup Apps (Sub) INT, FL Cup Goals INT, Other Apps INT, Other Goals INT, Total Apps (Sub) VARCHAR, Total Goals INT) CREATE TABLE european_tour_professional_career_summary (european_tour_professional_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Starts INT, Cuts made INT, Wins INT, 2nd INT, 3rd INT, Top 10 INT, Top 25 INT, Earnings (€) INT, Money list rank INT) CREATE TABLE 1960s_giants_12-6 (1960s_giants_12-6_id AUTO_INCREMENT PRIMARY KEY, Year INT, Date VARCHAR, Winner VARCHAR, Result VARCHAR, Loser VARCHAR, Location VARCHAR) CREATE TABLE series_ratings (series_ratings_id AUTO_INCREMENT PRIMARY KEY, Season INT, # of Episodes INT, Timeslot VARCHAR, Season Premiere VARCHAR, Season Final VARCHAR, Peak Audience INT, Average Audience INT, Average Nightly Rank VARCHAR, Average Weekly Rank VARCHAR, Average Yearly Ranking VARCHAR)  
SELECT MAX League Apps (Sub) FROM sheffield_united_career